Third U2 song in LIVE AID?

I read a website dedicated to Live Aid and I heard that the finale was
"Do They Know It's Christmas / Feed The World" and Bono sang in it
with David Bowie among others. Is there any boot with this?

More LIVE AID questions:

1. Was the entire performance broadcasted? If not, what parts of the
concert was broadcast?

2. Is there a "Live Aid" boot (as opposed to the usual U2 boots with
the Live Aid performance)? If not, who are the prominent performaers
who had their perfomances released in bootleg form?

Bye for now,

Jovi

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